If you're chasing a more vintage-tinged fuzz tone, free from the harsh bite and generally "buzzier" sound than current silicon-based pedals, a great germanium fuzz pedal is what you're after. Germanium fuzzes, while harder to design due to the general instability wide tolerances of the transistors themselves, are notoriously smoother and softer sounding than their silicon counterparts and deliver the sound of the '60s like nothing else can.